From: IrgendwerA8 <c.krueger.b@web.de>
Date: Tue, 22 May 2018 16:35:05 +0000 (+0200)
Subject: Fix for 8x16 multiplication if operants are swapped.
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=808d3ab4714c2bf393b0befddafe2a7ea7897289;p=cc65

Fix for 8x16 multiplication if operants are swapped.
---

diff --git a/libsrc/runtime/mul.s b/libsrc/runtime/mul.s
index a9b53293b..769cf9d8e 100644
--- a/libsrc/runtime/mul.s
+++ b/libsrc/runtime/mul.s
@@ -62,7 +62,8 @@ tosumulax:
 @L4:    ldy     ptr1            ; Save right operand (8 bit)
         ldx     ptr4            ; Copy left 16 bit operand to right
         stx     ptr1
-        ldx     ptr4+1          ; Don't store, this is done later
+        ldx     ptr4+1          ; swap high-byte too
+        stx     ptr1+1
         sty     ptr4            ; Copy low 8 bit of right op to left
         ldy     #8
         jmp     mul8x16a